eclipse is not able to start jboss 5.0.1GA

eclipse is not able to start jboss, first it said 8080 is in use, then i changed the port to 8085 in the server view of eclise.
In the console it is showing as started... but later it is giving as server cannot start in 50sec .. try incrasing the default time. i increased it to 180 sec but still its giving the same thing.
how to solve this.
Thanks,
Geeta